In 219 AD, Guan Yu's Northern Expedition shocked China. At the same time, in Nanyang County, far away from the main battlefield, the guard Hou Yin could not bear Cao Cao's heavy labor, so he joined forces with Guan Yu to launch a rebellion. Cao Cao sent the famous general Cao Ren to quell the rebellion. The only throat connecting Nanyang's front line and Guan Yu's rear was Qingni Pass.
A secret war, espionage war and psychological war surrounding this small pass were wildly staged among Cao Ren, Guan Yu, Hou Yuan, as well as the Nanyang nobles and Cao Wei's internal forces.
An isolated pass, with three forces (Cao, Liu, rebels), and spies from all directions (plus the local wealthy families of Soochow and Nanyang). Everyone is a chess piece, and everyone wants to be a chess player. There is the innocence and destruction of the idealist (Hou Yin), the tear between the loyal minister (General Cao Ren) between military orders and conscience, the precise calculation of the counselors in family survival and political battles, and the astonishing wisdom and courage of the little people in order to survive in the torrent of the times. Its outcome directly affected the food routes and reinforcements of Guan Yu's Northern Expedition, and it can be called the "second hidden line" of the Xiangfan War. Every heartbeat here involves the pulse of the Martial Saint thousands of miles away.
